View source for PNO-V-86-025, on 860429,during Insp of multi-pin Connectors, Licensee Discovered Pin Engagement of Connectors May Be Insufficient & May Cause Open Circuit When Wires Moved.Both Trains of balance-of-plant ESF Declared Inoperable

{{Adams
| number = ML20203P423
| issue date = 04/30/1986
| title = PNO-V-86-025:on 860429,during Insp of multi-pin Connectors, Licensee Discovered Pin Engagement of Connectors May Be Insufficient & May Cause Open Circuit When Wires Moved.Both Trains of balance-of-plant ESF Declared Inoperable
| author name = Miller L, Zimmerman R
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION V)
| addressee name = 
| addressee affiliation = 
| docket = 05000528, 05000529, 05000530
| license number = 
| contact person = 
| document report number = PNO-V-86-025, NUDOCS 8605070223
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:F PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V-86-25 Date: 04/30/86 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation and is basically all that is known by Region V staff on this date.
FACILITY: Arizona Nuclear Power Project                           Emergency Classification Palo Verde Unit 1, 2, and 3                               Notification of Unusual Event DOCKET No. 50-528, 50-529, 50-530                         Alert Site Area Emergency General Emergency X Not Applicable

==SUBJECT:==
DEFECTIVE ENGINEERED SAFETY FEATURES SYSTEM ELECTRICAL CONNECTORS On April 29, 1986, during an inspection of the multi-pin connectors used in the balance of plant (BOP) engineered safety system control circuits, the licensee discovered that the pin engagement of the connectors may be insufficient and may cause an open circuit when the wires of the connector assembly are moved. The inspection was conducted as a follow-up to the loss of power initiation reported in the PNO-V-86-24. The condition may result in engineered cafety features iroperability during a seismic event. This condition is generic to all three units.
Based on this finding, the licensee declared both trains of BOP engineered safety features inoperable. Unit 2 was in Mode 3 at the time of the finding and is in the process of cooling down to Mode 5. Unit 1 is currently in Mode 5 for a maintenance outage. Unit 3 is still in the initial phase of preoperational testing.
The licensee is evaluating, with the vendor representatives of the affected control equipment, what modifications are necessary to correct the problem.
The resident inspectors are following this matter closely.
This information is current as of 9:00 am. (MST), on April 30, 1986.
CONTACT:   R. Zimmerman, Sr. Resident Inspector         L. Miller (602) 386-5260                               (415) 943-3869 DISTRIBUTION H St.               MNBB      Phillips       E/W     Willste       Air Rights     ! M ail:
Chairman Palladino EDO           NRR           IE      NMSS                         ADM:DMB Comm. Zech            PA                       OIA     RES                          DOT:Trans Only Comm. Bernthal        MPA                      AEOD Comm. Roberts         ELD Comm. Asselstine                 Regions:
SECY                             INP0],'f/ NSAC]/ 3 2_
ACRS                             Licensee: 3 / C(~7 CA                               (Reactor Licensees)          REGION V: FORM 211 PDR                              Resident Inspectord[f)I             (Revised 3/14/83) 8605070223 860430                               _
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PDR    ILE                                                                     !
PNO-V-86-02S        PDR                                     -
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